Natural zeolite powder in cementitious composites and its application as heavy metal absorbents

Rudžionis, Žymantas; Adhikary, Suman Kumar; Manhanga, Fallon Clare; Ashish, Deepankar Kumar; Ivanauskas, Remigijus; Stelmokaitis, Gediminas; Navickas, Arūnas Aleksandras

doi:10.1016/j.jobe.2021.103085

Cited by 30 publications

(12 citation statements)

References 47 publications

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“…A porous honeycomb-like microstructure was observed for the ZP30 mix. This could be attributed to the porous structure of the zeolite combined with the high percentage replacement of OPC [54,55]. It can be observed that for each selected curing age, the initial slope of the echo trains of the pastes containing micronized natural zeolite was steeper than the slope for the reference mix.…”

Section: Nmr Relaxometrymentioning

confidence: 95%

Analysis of Pore Structure in Cement Pastes with Micronized Natural Zeolite

et al. 2023

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The continuous development of urban areas around the world led to an increase in construction material use and demand, with concrete seeing significant market uptake. Although significant progress has been made to reduce the environmental impact of concrete, there is still a stringent need for improvement. One of the most widely used methods to reduce the environmental impact of the cement industry and the construction industry alike is the replacement of ordinary Portland cement (OPC) by supplementary cementitious materials (SCM). Aside from by-products of industry, SCMs could also come from natural sources. Taking into account the porous structure of zeolites and their contribution to the improvement of the mechanical and durability properties of cement-based materials, the analysis of pore structure in cement pastes incorporating micronized natural zeolite is deemed necessary. In this research, the OPC was replaced by zeolite in three different percentages: 10%, 20%, and 30% by mass. The evolution of pore structure was investigated by means of nuclear magnetic resonance relaxometry at the curing ages of 1, 7, and 28 days. The microstructure of cement pastes was assessed by scanning electron microscopy investigations at 1, 7, 14, 21, and 28 days. The obtained results show that smaller pore sizes are present in cement pastes containing zeolites during the first 7 days. However, at the age of 28 days, the reference mix exhibits a similar pore structure to the mix containing 10% micronized zeolite due to the presence of larger amounts of hydration products. Increasing the replacement percentage to 30% results in larger pores, as indicated by larger values of the relaxation time.

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Section: Nmr Relaxometrymentioning

confidence: 95%

Analysis of Pore Structure in Cement Pastes with Micronized Natural Zeolite

et al. 2023

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“…The irregular features of the fine-sized and metamorphic particles allowed the formation of small sized and irregular-shaped bubbles [48] in the RQA tailings mortar, in comparison with the pseudospherical natural sand particles that formed middle sized bubbles in the CRE reference mortar, contributed to the difference of the mechanical resistance, because the rupture in the contours of the particles with different shapes, will allow the degradation of mechanical properties. The presence of micro-cracks, especially in the interfacial transition zone (ITZ) between and cement-crystal [49] and particle in the aggregate of RQA tailing has noticeable impacts on the total pore volume [50]. Even so, the results showed good mechanical strengths.…”

Section: Characteristics Of Mortars After the Breakage By Semmentioning

confidence: 99%

Amethyst quartz tailings in cement mortars production

et al. 2023

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Brazil has immense potential in the production of quartz and its gem varieties, consequently generating huge amounts of waste. This research aims to utilize the amethyst quartz tailings from the Alto Bonito mine-Brazil accumulated for decades in waste dumps, through a specific study of cementitious mortar production, considering the mineralogical and chemical characterization; evaluation the use of tailings as a fine aggregate for mortar production; estimate the technical feasibility through mechanical tests and; characterize of specimens by SEM after breakage. The tailings are quartz associated with mica. Quartz is polycrystalline with medium to fine grain, being SiO 2 the main component. The comminuted tailings showed a very fine fineness modulus, affecting the formulations. With cement:tailings (1:3) traces the mechanical tests show 5.65 Mpa and 1.05 Mpa to compressive and flexural strength respectively, slightly below the reference. The fine-sized and metamorphic morphology of the tailings affects the mechanical strength of the mortar. The process adopted in the production of mortars with total replacement of the fine aggregate have a great impact contributing to the reduction of waste in dumps, minimizing the environmental impact of mining, in addition to benefiting the Amethyst Miners Cooperative.

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“…Furthermore, zeolite powder offers excellent thermal insulation properties. Its porous structure acts as a barrier against heat transfer, trapping air and reducing the need for additional insulation materials [17]. This characteristic can contribute to energy efficiency and improved thermal performance in buildings.…”

Section: Introductionmentioning

confidence: 99%

Prediction on partial replacement of cement and coarse aggregate by zeolite powder and steel slag in high-performance concrete

Annadurai

2024

Eng. Res. Express

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High performance concrete is obtained by the inclusion of mineral admixtures like silica fume and fly ash in the concrete.. The research explores the viability and performance of sustainable concrete by introducing zeolite powder as a partial substitute for cement and steel slag as a partial replacement for coarse aggregate in M-70 grade concrete. Zeolite powder, possessing pozzolanic properties, is a natural or synthetic aluminosilicate material, while steel slag is an industrial byproduct with potential as an alternative aggregate source. The main objective is to investigate the impact of zeolite powder and steel slag on the development of High-Performance Concrete (M-70) in accordance with BIS standards.The formulation of high-performance concrete involved replacing 12.5%, 15%, and 17.5% of the cement with zeolite powder and varying the proportion of steel slag as a replacement for coarse aggregate (ranging from 30% to 55%). A comprehensive mechanical test was conducted on these specimens and compared with conventional concrete. Among the 21 mixes, the optimal combination was identified, incorporating 15% zeolite powder as a cement replacement and 45% steel slag as a coarse aggregate replacement, resulting in superior performance compared to conventional concrete.Subsequently, the experimental results were compared with predicted outcomes using the Taguchi method. The close alignment between the values obtained experimentally and those predicted further validates the effectiveness of the optimized mix ZP15SS45. This mix was further studied for water absorption, non-destructive testing, and microstructural analysis. The results from these investigations indicate that the optimum mix outperforms conventional concrete in terms of water absorption, non-destructive testing, and microstructural characteristics.

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Natural zeolite powder in cementitious composites and its application as heavy metal absorbents

Cited by 30 publications

References 47 publications

Analysis of Pore Structure in Cement Pastes with Micronized Natural Zeolite

Analysis of Pore Structure in Cement Pastes with Micronized Natural Zeolite

Amethyst quartz tailings in cement mortars production

Prediction on partial replacement of cement and coarse aggregate by zeolite powder and steel slag in high-performance concrete

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